To circulate the movement of air in and out of a building, the mechanical ventilation system uses exhaust fans attached to the walls or installed in the duct system. When the hot and moist airĀ comes in contact with the cold surface condensation occurs because the surface is at lower temperature. The fans either pull this air to the outside or transfer air to adjust the air quality inside.
So, a mechanical ventilation system is the best method especially in the current atmospheric conditions to remove all the harmful chemicals, odors and bad air from your house.